Veritas Volume Manager identifies a mirrored volume as a plex. A plex can
be backed up without unmounting it or taking the entire volume offline. This
result is accomplished by creating a snapshot copy of the volume and backing
up this temporary volume without halting the system or denying user access
to the data.

Ensure that the cluster is running without errors before performing
the backup procedure.

The phys-schost# prompt
reflects a global-cluster prompt. Perform this procedure on a
global cluster.

This procedure provides the long forms of the Sun Cluster commands.
Most commands also have short forms. Except for the long and short forms of
the command names, the commands are identical. For a list of the commands
and their short forms, see Appendix B, Sun Cluster Object-Oriented Commands.

Log on to any node in the cluster,
and become superuser or assume a role that provides solaris.cluster.admin RBAC authorization on the current primary node for the disk group
on the cluster.

List the disk group information.

# vxprint -gdiskgroup

Determine which node has the
disk group currently imported, indicating it is the primary node for the disk
group.

# cldevicegroup status

Create a snapshot of the volume.

# vxassist -gdiskgroupsnapstartvolume

Note –

Creating a snapshot can take a long time, depending on the size
of your volume.

Verify that the new volume was
created.

# vxprint -gdiskgroup

When the snapshot is complete, a status of Snapdone displays
in the State field for the selected disk group.

Stop any data services that are accessing the file
system.

# clresourcegroup offline resource-group

Note –

Stop all data services to ensure that the data file system is
properly backed up. If no data services are running, you do not need to perform Step 6 and Step 8.

Create a backup volume named bkup-vol and attach the snapshot volume to it.

# vxassist -gdiskgroupsnapshotvolumebkup-vol

Restart
any data services that were stopped in Step 6,
using the clresourcegroup command.

# clresourcegroup online - zone -n noderesourcegroup

node

The name of the node.

zone

The name of the global-cluster non-voting node (node) that can master the resource group. Specify zone only
if you specified a non-voting node when you created the resource group.

Verify the volume is now attached
to the new volume bkup-vol.

# vxprint -gdiskgroup

Register the device group configuration
change.

# cldevicegroup sync diskgroup

Check the backup volume.

# fsck -y /dev/vx/rdsk/diskgroup/bkup-vol

Perform a backup to copy the
volume bkup-vol to tape or another medium.

Use
the ufsdump(1M) command
or the backup utility that you normally use.

In the following example, the cluster node phys-schost-2 is
the primary owner of the device group schost-1. Therefore,
the backup procedure is performed from phys-schost-2. The
volume /vo101 is copied and then associated with a new
volume, bkup-vol.